This year in our newest large coop and run, I have created the deep litter method. Pine, untreated wood mulch, dirt, and sand. All nice and wonderful until the two Pekin Ducks grew bigger and their smell of urine is overwhelming. We have 12 hens, 2 roosters, and 2 Pekin Ducks. All except one are new this spring. The run is not so overwhelming as the inside of the new coop. I was so excited to maybe have the same bedding all winter and change it in the spring. There is two windows for ventilation in the coop but winter in Minnesota is coming the they must be shut. Any ideas?